The answer is “C”. Natural selection is about ones traits being better than another’s which allow it to survive in the wilds longer.
You could put salt-crystals outside during different times of the day when the temperature drops or rises.
When you relax the smooth muscles in arteries, it affects the blood pressure quite a lot. If you're a up and running person, you're most likely not always relaxed. Although - if you manage to relax, it would cause your blood pressure to lower from a high rate, to a much lower rate. That's the main outcome of this.
